Apparatus and method for fabric cleaning with foam

• US 4,974,618 A
• Filed: 09/09/1985
• Issued: 12/04/1990
• Est. Priority Date: 08/31/1983
• Status: Expired due to Term

• Current Assignee: Duraclean International Incorporated
• Original Assignee: Duraclean International Incorporated
• Inventors: Nysted, Leonard N.
• Primary Examiner(s): Stinson, Frankie L.
• Application Number:
  US06/774,168
• Time in Patent Office: 1,912 Days
• Field of Search: 15/320, 15/321, 261/DIG. 26, 134/21, 134/34
• US Class Current: 134/21
• CPC Class Codes: A47L 11/34 Machines for treating carpets in position by liquid, foam, or vapour, e.g. by steam
• CPC Class Codes: A47L 11/4016 specially adapted for collecting fluids
• CPC Class Codes: A47L 11/4083 Liquid supply reservoirs; Preparation of the agents, e.g. mixing devices

Abstract

An apparatus and method, particularly adapted to clean fabrics, is disclosed. The apparatus includes a generally hollow head having two foam mixing chambers in close proximity to a vacuum chamber. Foam is generated adjacent the fabric to be cleaned by admixing pressurized air and a liquid foam-producing agent in the two mixing chambers. The air pressure directs the foam from the second mixing chamber towards the fabric. Two screens are used to control the consistency and application of the foam. Suction is simultaneously provided in the vacuum chamber, so that the foam is rapidly and continuously recovered. A brush means is positioned between the second mixing chamber and the vacuum chamber to further agitate the foam and fabric to be cleaned, and to help create a partial pressure when the moving foam is applied to the surface of a fabric.

Claims

1. In a fabric cleaning apparatus having a generally hollow head defining a cleaning agent chamber with a bottom opening for applying a cleaning agent to a fabric to be cleaned, and a vacuum chamber with a bottom opening positioned forward of the cleaning agent chamber for generating suction to remove the cleaning agent from the fabric, the improvement comprising:

the cleaning agent chamber having a first mixing chamber and a second mixing chamber, the second mixing chamber including the bottom opening of the cleaning agent chamber;

means for providing a cleaning solution to the first mixing chamber;

means for providing pressurized air to the first mixing chamber;

means for controlling the delivery of the cleaning solution and pressurized air to the first mixing chamber so that the cleaning solution and pressurized air admix to generate foam;

first screen means, adjacent the first mixing chamber through which the foam is expressed into the second mixing chamber, for regulating the consistency of the foam;

second screen means, adjacent the bottom opening of the second mixing chamber through which the foam is expelled towards the fabric to be cleaned, for the regulating the consistency of the foam;

a plurality of non-rotating brush bristles positioned between the second mixing chamber bottom opening and the suction chamber bottom opening; and

the suction and pressurized air cooperating, when the bottom of the head is applied to a fabric, to move the foam rapidly and continuously under partial pressure from the second mixing chamber bottom opening, across the fabric, between and over the brush bristles, and into the vacuum chamber bottom opening so that the rapidly moving foam and brush bristles combine to agitate, release, and suspend dirt from the fabric into the foam which is removed by the suction.

2. The invention of claim 1 wherein the cleaning solution is provided to the first mixing chamber in a direction perpendicular to the direction in which the pressurized air is provided to the same chamber.

3. The invention of claim 1 wherein the first screen means is cylindrical in shape.

4. A fabric cleaning apparatus having front and back ends comprising:

means, adjacent one of the ends, for continuously generating foam with positive pressure;

means for continuously propelling the foam under positive pressure from the foam generating means out of the cleaning apparatus towards the fabric to be cleaned;

vacuum means, adjacent the other end, for continuously and concurrently removing foam from the fabric; and

the propelling means and vacuum means cooperating to move the foam rapidly and continuously between the front and back ends of the apparatus without rotating brush means and, when the moving foam is continuously applied to the surface of a fabric, foam bubbles will compress under the positive pressure applied by the propelling means and resistance provided by the fabric, and expand under the vacuum means, so that the foam moves across the fabric rapidly, continuously, and under partial pressure.

5. The invention of claim 4 wherein the foam generating means includes means for admixing pressurized air and a cleaning solution to generate foam.

6. A fabric cleaning apparatus having front and back ends comprising:

means, adjacent one of the ends, for continuously generating foam under positive pressure;

suction means, adjacent the other end, for continuously and concurrently removing foam from the fabric to be cleaned;

stationary brush means positioned between the foam generating means and the suction means;

means for continuously propelling the foam under positive pressure from the foam generating means out of the cleaning apparatus towards the fabric to be cleaned and the brush means; and

the propelling means and suction means cooperating to move the foam rapidly and continuously between the front and back ends of the apparatus and, when the moving foam is continuously applied to the surface of a fabric, foam bubbles will compress under the positive pressure provided by the propelling means and the resistance to the moving foam provided by the fabric and brush means, and will expand under the suction means, so that the foam moves across the fabric and over and through the brush means rapidly, continuously, and under partial pressure.

7. The invention of claim 6 wherein the foam generating means includes means for admixing pressurized air and a cleaning solution to generate foam.

8. A fabric cleaning apparatus having front and back ends comprising:

means for supplying pressurized air;

means for supplying a cleaning solution;

continuous foam generating means, adjacent one of the ends, for continuously admixing the pressurized air and cleaning solution to continuously generate foam under positive pressure and for continuously propelling the foam under positive pressure out of the cleaning apparatus towards the fabric to be cleaned and a stationary brush means;

vacuum means, adjacent the other end, for continuously and concurrently removing foam from the fabric to be cleaned;

the stationary brush means positioned between the foam generation means and the vacuum means; and

the vacuum means cooperating with the foam generation means to move the foam rapidly and continuously between the front and back ends of the apparatus and, when the moving foam is continuously applied to the surface of a fabric, foam bubbles compress under the positive pressure of the continuously generated and propelled foam and the resistance to moving foam provided by the fabric and the brush means, and will expand under the vacuum means, so that the foam moves across the fabric and over and through the brush means rapidly, continuously, and under partial pressure.

9. The invention of claim 8 wherein the foam generating means includes a first mixing chamber.

10. The invention of claim 9 wherein the foam generating means includes a second mixing chamber having an opening through which the foam is propelled towards the fabric to be cleaned.

11. The invention of claim 10 wherein the first mixing chamber is cylindrical in shape.

12. The invention of claim 8 wherein the foam generating means includes a first screen for controlling the consistency of the foam.

13. The invention of claim 12 wherein the foam generating means includes a second screen for controlling the consistency of the foam.

14. The invention of claim 8 further comprising means for adjusting the pressurized air supply means and cleaning solution supply means.

15. In a hand-held fabric cleaning apparatus having a generally hollow head defining a cleaning agent chamber with a bottom opening for applying a cleaning agent to a fabric to be cleaned, and a vacuum chamber with a bottom opening positioned forward of the cleaning chamber for generating suction to remove the cleaning agent from the fabric, the improvement comprising:

means for providing a cleaning solution to the cleaning agent chamber;

means for providing pressurized air to the cleaning agent chamber;

continuous foam generation means for controlling the delivery of the cleaning solution and pressurized air to the cleaning agent chamber so that the cleaning solution and pressurized air continuously admix to continuously generate foam under positive pressure and for continuously propelling the foam under positive pressure out of the cleaning agent bottom opening towards the fabric to be cleaned and a stationary brush means;

the stationary brush means positioned between the cleaning agent chamber bottom opening and the vacuum chamber bottom opening;

the vacuum chamber continuously and concurrently providing suction to remove foam from the fabric to be cleaned; and

the suction cooperating with the foam generation means to move the foam rapidly and continuously between the cleaning agent chamber bottom opening and the vacuum chamber bottom opening and, when the moving foam is continuously applied to the surface of a fabric, foam bubbles will compress under the positive pressure of the continuously generated and propelled foam and the resistance to moving foam provided by the fabric and brush means, and will expand under the suction of the vacuum chamber, so that the foam moves across the fabric and over and through the brush means rapidly, continuously, and under partial pressure.

16. A method for cleaning fabric comprising:

continuously generating foam under positive pressure at a point adjacent to the fabric to be cleaned;

continuously propelling the foam under positive pressure against the fabric to be cleaned so that foam bubbles compress against the fabric under the positive pressure;

continuously and concurrently removing the foam from the fabric by suction so that the foam bubbles expand under the negative pressure of the suction; and

moving the foam rapidly and continuously across the surface of the fabric between the point of foam generating and suction and under partial pressure resulting from the continuous positive pressure on the foam and the suction, and without rotating brush means.

17. The invention of claim 16 wherein the foam generating step includes admixing pressurized air and cleaning solution in a chamber adjacent the fabric to be cleaned.

18. The invention of claim 16 wherein the moving step includes moving the foam over and through a stationary brush positioned between the point of foam generation and suction.